PIC16F7X7
REGISTER 6-1:
OPTION_REG: OPTION CONTROL REGISTER (ADDRESS 181h)
R/W-1
RBPU
R/W-1
R/W-1
T0CS
R/W-1
T0SE
R/W-1
PSA(1)
R/W-1
PS2
R/W-1
PS1
R/W-1
PS0
INTEDG
bit 7
bit 0
bit 7
bit 6
bit 5
bit 4
bit 3
RBPU: PORTB Pull-up Enable bit
1= PORTB pull-ups are disabled
0= PORTB pull-ups are enabled
INTEDG: Interrupt Edge Select bit
1= Interrupt on rising edge of RB0/INT pin
0= Interrupt on falling edge of RB0/INT pin
T0CS: TMR0 Clock Source Select bit
1= Transition on T0CKI pin
0= Internal instruction cycle clock (CLKO)
T0SE: TMR0 Source Edge Select bit
1= Increment on high-to-low transition on T0CKI pin
0= Increment on low-to-high transition on T0CKI pin
PSA: Prescaler Assignment bit(1)
1= Prescaler is assigned to the WDT
0= Prescaler is assigned to the Timer0 module
Note 1: To avoid an unintended device Reset, the instruction sequence shown in the
”PICmicro® Mid-Range MCU Family Reference Manual” (DS33023) must be
executed when changing the prescaler assignment from Timer0 to the WDT. This
sequence must be followed even if the WDT is disabled.
bit 2-0
PS<2:0>: Prescaler Rate Select bits
Bit Value TMR0 Rate WDT Rate
000
001
010
011
100
101
110
111
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
1 : 1
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
2004 Microchip Technology Inc.
DS30498C-page 75
MICROCHIP [ MICROCHIP ]
